MMORPG design: Raid levels

[symbioidlj]

What if, in a game, there was no set raid size, but rather an instance was rated a certain minimum level which generally indicated the total level of all players. Obviously this would entail a lot of fine-tuning. And some things just don't scale, but within a general given range, you could do something like this so, say, you could 5 man a lvl 350 at level 70 or 10 mean it at level 35. Of course, this would assume a linear progression of strength which isn't the case at all (in WoW at least).

But I think the idea merits further reflection in some designer's mind.